Question

Escoge la forma correcta del verbo

Vosotros ______ las investigaciones necesarias.

harás
haremos
haréis

Answer 1

Hello:
This is future tense, and yet the endings for the verb forms are very similar to those used in present tense.

Here is the list of endings you'll need: (I'm giving you the endings with the verb *comer* [= "to eat"] as an example)

Future of COMER
yo - - comer + E (= comere) [English: "I will eat"]
tu - - comer + AS (= comeras)
el/ ella - - comer + A (= comera)
nosotros/ nosotras - - comer + EMOS (= comeremos)
vosotros/ vosotras - - comer + EIS (= comereis)
ellos/ ellas - - comer + AN (= comeran)

The verb in your question is *hacer* (= "to do"), which also ends in -ER, doesn't it? So (even though *hacer* is an irregular verb in Spanish), the endings will be the same...

Hope you can answer your question now!
Blessings

P.S.: Sorry I'm not using accents (which are needed on *tu* and *el*, and then on ALL the verb endings above, except for *-emos* [just check http://www.onoma.es/#comer+pronominal=false+tiempos=0$3$+personas=1$2$4$5$8$10$12$13$+paradigma=2 ]). Hope you'll remember to include them.